Regulation No. 125-01

Name:Regulation No. 125-01
Description:Forward Field of Vision of the Motor Vehicle Driver.
Official Title:Uniform Provisions Concerning the Approval of: Motor Vehicles with Regard to the Forward Field of Vision of the Motor Vehicle Driver.
Country:ECE - United Nations
Date of Issue:2013-07-15
Amendment Level:01 Series, Supplement 1
Number of Pages:27
Vehicle Types:Car
Subject Categories:Driver's Vision
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Keywords:

vehicle, approval, regulation, annex, plane, paragraph, reference, type, figure, points, appendix, point, angle, horizontal, driver, vertical, means, forward, amendments, vision, force, coordinates, field, date, position, entry, series, vehicles, defined, grid, obstruction, marks, area, windscreen, three-dimensional, contracting, granted, requirements, located, positions, pillar, approved, side, seat-back, table, manufacturer, relation, design, supplement, parties

Text Extract:

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E/ECE/324
) Rev.2/Add.124/Rev.2/Amend.1
E/ECE/TRANS/505 )
October 28, 2016
STATUS OF UNITED NATIONS REGULATION
ECE 125-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
MOTOR VEHICLES WITH REGARD TO THE FORWARD FIELD
OF VISION OF THE MOTOR VEHICLE DRIVER
Incorporating:
00 series of amendments
Date of Entry into Force: 09.11.07
Corr. 1 to the 00 series of amendments
Dated: 23.12.10
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 03.02.08
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 19.08.10
Supplement 3 to the 00 series of amendments
Date of Entry into Force: 09.12.10
Supplement 4 to the 00 series of amendments
Date of Entry into Force: 26.07.12
01 series of amendments
Date of Entry into Force: 15.07.13
Supplement 1 to the 01 series of amendments
Date of Entry into Force: 08.10.16

REGULATION No. 125-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR
VEHICLES WITH REGARD TO THE FORWARD FIELD OF VISION
OF THE MOTOR VEHICLE DRIVER
CONTENTS
REGULATION
1.
Scope
2.
Definitions for the Purpose of this Regulation
3.
Application for Approval
4.
Approval
5.
Specifications
6.
Test Procedure
7.
Modification of Vehicle Type and Extension of Approval
8.
Conformity of Production
9.
Penalties of Non-conformity of Production
10.
Production Definitively Discontinued
11.
Names and Addresses of Technical Services Responsible for Conducting Approval Tests, and of
Type Approval Authority
12.
Transitional Provisions
ANNEXES
Annex 1 − Communication
Annex 2 − Arrangements of Approval Marks
Annex 3 − Procedure for Determining the "H" Point and the Actual Torso Angle for Seating Positions in
Motor Vehicles
Appendix 1 − Description of the Three-dimensional "H" Point Machine (3-D H Machine)
Appendix 2 − Three-dimensional Reference System
Appendix 3 − Reference Data Concerning Seating Positions
Annex 4 − Method for Determining the Dimensional Relationships between the Vehicle's Primary
Reference Marks and the Three-dimensional Reference Grid.
Appendix

2.5. "Seat-back angle" means the angle defined in the Consolidated Resolution on the
Construction of Vehicles (R.E.3) , Annex 1, Paragraph 2.6. or 2.7.
2.6. "Actual seat-back angle" means the angle defined in R.E.3, Annex 1, Paragraph 2.6.
2.7. "Design seat-back angle" means the angle defined in R.E.3, Annex 1, Paragraph 2.7.
2.8. "V Points" means points whose position in the passenger compartment is determined as a
function of vertical longitudinal planes passing through the centres of the outermost
designated seating positions on the front seat and in relation to the "R" Point and the design
angle of the seat-back, which points are used for verifying compliance with the field of vision
requirements.
2.9. "R Point or seating reference point" means the point defined in R.E.3, Annex 1,
Paragraph 2.4.
2.10. "H Point" means the point defined in R.E.3, Annex 1, Paragraph 2.3.
2.11. "Windscreen datum points" means points situated at the intersection with the windscreen
of lines radiating forward from the V Points to the outer surface of the windscreen.
2.12. "Armoured vehicle" means a vehicle intended for the protection of conveyed passengers
and/or goods and complying with armour plating anti-bullet requirements.
2.13. "Transparent area" means that area of a vehicle windscreen or other glazed surface
whose light transmittance measured at right angles to the surface is not less than 70%. In
the case of armoured vehicles the light transmittance factor is not less than 60%.
2.14. "P Points" means the points about which the driver's head rotates when he views objects
on a horizontal plane at eye level.
2.15. "E Points" means points representing the centres of the driver's eyes and used to assess
the extent to which "A" pillars obscure the field of vision.
2.16. "A pillar" means any roof support forward of the vertical transverse plane located 68mm in
front of the V Points and includes non-transparent items such as windscreen mouldings and
door frames, attached or contiguous to such a support.
2.17. "Horizontal seat-adjustment range" means the range of normal driving positions
designated by the vehicle manufacturer for the adjustment of the driver's seat in the
direction of the X axis (see Paragraph 2.3. above).
2.18. "Extended seat-adjustment range" means the range designated by the vehicle
manufacturer for the adjustment of the seat in the direction of the X axis (see Paragraph 2.3.
above) beyond the range of normal driving positions specified in Paragraph 2.17. and used
for converting seats into beds or facilitating entry to the vehicle.

4.5. If the vehicle conforms to a vehicle type approved under one or more other Regulations,
annexed to the Agreement, in the country which has granted approval under this
Regulation, the symbol prescribed in Paragraph 4.4.1. need not be repeated; in such a
case, the Regulation and approval numbers and the additional symbols shall be placed in
vertical columns to the right of the symbol prescribed in Paragraph 4.4.1. above.
4.6. The approval mark shall be clearly legible and be indelible.
4.7. The approval mark shall be placed close to or on the vehicle data plate.
5. SPECIFICATIONS
5.1. Driver's Field of Vision
5.1.1. The transparent area of the windscreen must include at least the windscreen datum points
(see Annex 4, Appendix, Figure 1):
5.1.1.1. A horizontal datum point forward of V and 17° to the left (see Annex 4, Appendix, Figure 1);
5.1.1.2. An upper vertical datum point forward of V and 7° above the horizontal;
5.1.1.3. A lower vertical datum point forward of V and 5° below the horizontal;
5.1.1.4. To verify compliance with the forward-vision requirement on the opposite half of the
windscreen, three additional datum points, symmetrical to the points defined in
Paragraphs 5.1.1.1. to 5.1.1.3. in relation to the median longitudinal plane of the vehicle, are
obtained.
5.1.2. The angle of obstruction for each "A" pillar, as described in Paragraph 5.1.2.1., shall not
exceed 6° (see Annex 4, Appendix, Figure 3). In the case of armoured vehicles that angle
shall not exceed 10°.
The angle of obstruction of the "A" pillar on the passenger side, as defined in
Paragraph 5.1.2.1.2., need not be determined if the two pillars are located symmetrically in
relation to the median longitudinal vertical plane of the vehicle.
5.1.2.1. The angle of obstruction of each A pillar shall be measured by superimposing in a plane the
following two horizontal sections:
Section 1: Starting from the Pm point situated at the location defined in
Paragraph 5.3.1.1., draw a plane forming an angle of 2° upwards in relation to
the horizontal plane passing forward through Pm. Determine the horizontal
section of the "A" pillar starting from the foremost point of the intersection of the
"A" pillar and the inclined plane (see Annex 4, Appendix, Figure 2).
Section 2: Repeat the same procedure, taking a plane declining at an angle of 5°
downwards in relation to the horizontal plane passing forward through Pm (see
Annex 4, Appendix, Figure 2).
5.1.2.1.1. The angle of obstruction of the A pillar on the driver's side is the angle formed on the plane
view by a parallel, starting from E , to the tangent joining E with the outer edge of
Section S and the tangent joining E to the inner edge of Section S (see Annex 4,
Appendix, Figure 3).

5.1.3.3 An obstruction created by the steering-wheel rim and the instrument panel inside the
steering wheel will be tolerated if a plane through V , perpendicular to the plane x - z and
tangential to the highest part of the steering-wheel rim, is declined at least 1° below the
horizontal.
The steering wheel, if adjustable, shall be placed in the normal position indicated by the
manufacturer or, failing that, midway between the limits of its range(s) of adjustment.
5.1.3.4. An obstruction between a plane through V , and declined at least 1° below the horizontal
and a plane through V and declined 4° below the horizontal will be tolerated if the conical
projection of this obstruction, starting from V , on an Area "S" as defined in
Paragraph 5.1.3.2.1. does not exceed 20% of this area. The steering wheel, if adjustable,
shall be placed in the normal position indicated by the manufacturer or, failing that, midway
between the limits of its range(s) of adjustment
5.1.3.4.1. The Area "S" (see Annex 4, Appendix, Figure 7) is a rectangular vertical area located in a
plane perpendicular to the X coordinate 1,500mm forward of the Point V . The upper edge
of the Area "S" is defined by a plane passing through V declined forward 1° below the
horizontal. The lower edge of the Area "S" is defined by a plane passing through V declined
forward 4° below the horizontal. The left and right edges of the Area "S" are vertical and
generated from the intersection lines of the three planes declined 4° as defined in
Paragraph 5.1.2.2. above.
5.1.3.4.2. In the case of a windscreen extending beyond 1,500mm forward of the Point V , the
distance between the Area "S" and the Point V may be extended accordingly.
5.1.4. In the case where the height of V above the ground exceeds 1,650mm, the following
requirement shall be met:
A 1,200mm tall cylindrical object with a diameter of 300mm that is situated inside the space
bounded by a vertical plane located 2,000mm in front of the vehicle, a vertical plane located
2,300mm in front of the vehicle, a vertical plane located 400mm from the driver's side of the
vehicle, and a vertical plane located 600mm from the opposite side of the vehicle shall be at
least partially visible when viewed directly from V (see Figure 1), regardless of where the
object is within that space, unless it is invisible due to a blind spot(s) created by the A pillars,
windscreen wipers, or steering wheel.
If the driver's seat is located in the central driving position of the vehicle, the 1,200mm tall
cylindrical object shall be situated inside the space bounded by a vertical plane located
2,000mm in front of the vehicle, a vertical plane located 2,300mm in front of the vehicle, a
vertical plane located 500mm from the side of the vehicle (see Figure 2).

5.3. Position of the P Points
5.3.1. The position of the P Points in relation to the "R" Point, as indicated by the XYZ coordinates
from the three-dimensional reference grid, are as shown by Tables II, III and IV.
5.3.1.1. Table II sets out the base coordinates for a design seat-back angle of 25°. The positive
direction of the coordinates is set out in Annex IV, Appendix, Figure 1.
The Pm point is the point of intersection between the straight line joining P , P and the
longitudinal vertical plane passing through the "R" Point.
Table II
Point P X Y Z
P
P
Pm
35mm
63mm
43.36mm
-20mm
47mm
0mm
627mm
627mm
627mm
5.3.1.2. Table III indicates the further corrections to be made to the X coordinates of P and P when
the horizontal seat-adjustment range as defined in Paragraph 2.16 exceeds 108mm. The
positive direction for the coordinates is indicated in Annex IV, Appendix, Figure 1.
Table III
Horizontal seat-adjustment range
108 to 120mm
121 to 132mm
133 to 145mm
146 to 158mm
more than 158mm
∆x
-13mm
-22mm
-32mm
-42mm
-48mm

6. TEST PROCEDURE
6.1. Driver's Field of Vision
6.1.1. The dimensional relationships between the vehicle's primary reference marks and the
three-dimensional reference grid shall be determined by the procedure prescribed in
Annex 4.
6.1.2. The position of the Points V and V is determined in relation to the "R" Point as indicated by
the XYZ coordinates of the three-dimensional reference grid and are shown in Table I under
Paragraph 5.2.2. and Table IV under 5.4. The windscreen datum points shall then be found
from the corrected V Points as prescribed in Paragraph 5.1.1.
6.1.3. The relationship between the P Points, the "R" Point, and the centre-line of the driver's
seating position, as indicated by XYZ coordinates from the three-dimensional reference grid,
shall be determined from Tables II and III in Paragraph 5.3. The correction for design
seat-back angles other than 25° is shown in Table IV under Paragraph 5.4.
6.1.4. The angle of obstruction (see Paragraph 5.1.2.) shall be measured in the inclined planes, as
indicated in Annex 4, Appendix, Figure 2. The relationship between P and P , which are
connected to E and E and E and E respectively, is shown in Annex 4, Appendix,
Figure 5.
6.1.4.1. Straight line E -E shall be set as described in Paragraph 5.5.2. The angle of obstruction of
the A pillar on the driver's side shall be measured as specified in Paragraph 5.1.2.1.1.
6.1.4.2. Straight line E -E shall be set as described in Paragraph 5.5.4. The angle of obstruction of
the A pillar on the passenger side shall then be measured as specified in
Paragraph 5.1.2.1.2.
6.1.5. The manufacturer may measure the angle of obstruction either on the vehicle or in the
drawings. In the event of doubt the Technical Services may require the tests be carried out
on the vehicle.
7. MODIFICATION OF VEHICLE TYPE AND EXTENSION OF APPROVAL
7.1. Every modification of the vehicle type as defined in Paragraph 2.2. above shall be notified to
the Type Approval Authority which approved the vehicle type. The department may then
either:
7.1.1. Consider that the modifications made do not have an adverse effect on the conditions of the
granting of the approval and grant an extension of approval;
7.1.2. Consider that the modifications made affect the conditions of the granting of the approval
and require further tests or additional checks before granting an extension of approval.
7.2. Confirmation or refusal of approval, specifying the alterations, shall be communicated by the
procedure specified in Paragraph 4.3. above to the Contracting Parties to the Agreement
which apply this Regulation.
7.3. The Type Approval Authority shall inform the other Contracting Parties of the extension by
means of the communication form which appears in Annex 2 to this Regulation. It shall
assign a serial number to each extension, to be known as the extension number.

12.4. Even after the entry into force of the 01 series of amendments to this Regulation, type
approvals of the vehicles to the original version of this Regulation shall remain valid.
Contracting Parties applying this Regulation shall continue to accept them.
12.5. Notwithstanding the transitional provisions above, Contracting Parties whose application of
this Regulation comes into force after the date of entry into force of the 01 series of
amendments are not obliged to accept approvals which were granted in accordance with the
original version of this Regulation.

12. Approval with regard to the driver's field of vision is granted/refused: .............................................
13. Place: ...................................................................................................................................................
14. Date: ....................................................................................................................................................
15. Signature: ............................................................................................................................................
16. Annexed to this communication are the following documents, bearing the approval number
indicated above:
................................... dimensional drawings
................................... exploded view or photograph of the passenger compartment
17. Any remarks: .......................................................................................................................................

ANNEX 3
PROCEDURE FOR DETERMINING THE "H" POINT AND THE ACTUAL
TORSO ANGLE FOR SEATING POSITIONS IN MOTOR VEHICLES
Appendix 1 Description of the Three-dimensional H Point Machine (3-D H Machine)
Appendix 2 Three-dimensional Reference System
Appendix 3 Reference Data Concerning Seating Positions

ANNEX 4 − APPENDIX
Figure 1
Determination of V Points
Line tracing the median longitudinal plane of the vehicle.
Line tracing the vertical plane passing through R.
Line tracing the vertical plane passing through V and V .

Figure 3
Angles of Obstruction

Figure 5
Dimensional Diagram Showing Relative Positions of E Points and P Points

Figure 7
Definition of the Area "S"
(Paragraph 5.1.3.2.)
Forward Field of Vision of the Motor Vehicle Driver.